I have d/l a trio of empty layouts, for the route between Portland and Seattle. And I have seen many others, by Trainblankroutes.com. NOTE: These do NOT have any terrain features like grass or rock, no trees, no roads, just complete blank boards but with proper grades and contours.
Another note: As I have been working on building my line from Portland south, I have as yet to do anything with the three Washington blanks, but thought I would at least let you know they and others are out there.